Year 7 - Science - 27.11.13

Thai Sikh International School

E-Learning Programme – Online Assignment –  12/09/2013

Name :                                                                                       Subject :  General science

Year   :  7 A/B                                    Revision                                              Week  No. 5                       

1. Which of the following is found ONLY in plant cells?

a. cell membrane

b. cytoplasm

c. nucleus

d. chloroplast

2. Which has the most acidic pH?

a. 2.5

b. 3.5

c.       4.5

d.      5.5

e.       6.5

3. Reproduction that requires 2 parents is:

a.      sexual

b.      asexual

C. binary fission

D.    Cytokinesis

4. Current moving in a wire

a.       Mechanical energy

b.      Thermal energy

3. Electrical energy
4. Nuclear energy

5. The female reproductive organ that produces a thick, nutrient rich lining for fertilized egg is:

a.       ovary

b.      uterus (lining thickens between 6 to 25^th day)

3. Fallopian tubes
4. Prostate

6. Stored Energy is called Kinetic Energy

a.       True

b.      False

7. The heart is an example of which level of organization?

a.       cellular

b.      tissue

3. organ system
4. organ

8. What process in the female reproductive system allows blood and tissue from the uterus to break down (26^th and 28^th day starts to break down) and pass through the vagina monthly?

a.       reproduction

b.      Meiosis

3. menstruation (1-4^th day in periodic cycle)
4. ovulation (12 – 14^th day in periodic cycle)

9. The ability to do work.

a.       force

b.      energy

3. pulley

10. Which of the following shows the correct order from least complex to most complex?

a.       cells-organs-tissues-organ systems

b.      tissues-organs-cells-organ systems

3. cells-tissues-organs-organ systems
4. organ systems-organs-tissues-cells

11. What is the unit for work?

a.      joule

b.      joule per second

3. newton
4. watt

12. Identical twins are always the same sex.

a.      True

b.      False

13. The carbonates reacts with acids to produce salt, carbon dioxide and water

CaCO₃ + 2HCl            ----->    CaCl₂  + CO₂ + H₂0

a.       Name the salt and gas produced in this reaction?

……………………………………………………………………….. ……

14. The following equation shows what happens when magnesium ribbons react with acids

Mg + 2HCl      ----->    MgCl_2(aqueous)  + H_2(gas)

a.       What would you see happening to magnesium? What products are formed?

……………………………………………………………………………….

b.      What are the properties of hydrogen?

………………………………………………………………………………..

………………………………………………………………………………..

c.       What is an acid?

………………………………………………………………………………...

15. The part of flower which receives pollen grains before fertilization can take place is …….

16. What do you mean by potential energy and kinetic energy?

            ………………………………………………………………………………..

17. What are the examples of renewable and non renewable energy?

18. The universal indicator turns ………….. colour when a drop is added to 100 ml distilled water? Why?

19. What do you mean by in vitro fertilization?

            …………………………………………………………………………………………….

20. In human fertilization happens in ………………..and implantation takes place in ………